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From 2db24b5a4b5a760a0cf014e7285b0f07f0a63762 Mon Sep 17 00:00:00 2001
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Message-Id: <2db24b5a4b5a760a0cf014e7285b0f07f0a63762.1418766606.git.jen@redhat.com>
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In-Reply-To: <6f81b4847eb68ebdf54a8f1a771e19d112d74152.1418766606.git.jen@redhat.com>
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References: <6f81b4847eb68ebdf54a8f1a771e19d112d74152.1418766606.git.jen@redhat.com>
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From: Fam Zheng <famz@redhat.com>
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Date: Thu, 4 Dec 2014 00:05:20 -0600
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Subject: [CHANGE 26/31] vmdk: Handle failure for potentially large allocations
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To: rhvirt-patches@redhat.com,
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jen@redhat.com
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1417651524-18041-27-git-send-email-famz@redhat.com>
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Patchwork-id: 62699
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O-Subject: [RHEL-7.1 qemu-kvm PATCH v5 26/30] vmdk: Handle failure for potentially large allocations
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Bugzilla: 1002493
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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From: Kevin Wolf <kwolf@redhat.com>
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Some code in the block layer makes potentially huge allocations. Failure
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is not completely unexpected there, so avoid aborting qemu and handle
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out-of-memory situations gracefully.
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This patch addresses the allocations in the vmdk block driver.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Benoit Canet <benoit@irqsave.net>
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(cherry picked from commit d6e5993197990ff55c660714526681fa7028299e)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Jeff E. Nelson <jen@redhat.com>
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---
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block/vmdk.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/block/vmdk.c b/block/vmdk.c
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index 70b616a..560dd43 100644
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -456,7 +456,11 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
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/* read the L1 table */
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l1_size = extent->l1_size * sizeof(uint32_t);
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- extent->l1_table = g_malloc(l1_size);
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+ extent->l1_table = g_try_malloc(l1_size);
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+ if (l1_size && extent->l1_table == NULL) {
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+ return -ENOMEM;
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+ }
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+
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ret = bdrv_pread(extent->file,
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extent->l1_table_offset,
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extent->l1_table,
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@@ -472,7 +476,11 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
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}
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if (extent->l1_backup_table_offset) {
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- extent->l1_backup_table = g_malloc(l1_size);
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+ extent->l1_backup_table = g_try_malloc(l1_size);
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+ if (l1_size && extent->l1_backup_table == NULL) {
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+ ret = -ENOMEM;
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+ goto fail_l1;
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+ }
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ret = bdrv_pread(extent->file,
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extent->l1_backup_table_offset,
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extent->l1_backup_table,
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--
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2.1.0
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